Rotary kiln.



PATENTED NOV. 21, 1905. H. SIMMONS.

J. HQLOGAN &:;-

RCJTAR I KILN. APPLICATIFON IIiLED JULY25. 1905.

BEST AVAILABLE ooP UNITED STATES PATENT oFFIoF.

JAMES H. LOGAN AND WILLIAM H. IMMONS, OF FENTON, MICHIGAN.

ROTARY zKlLN.

Specification of Litters Patent.

Patented Nov. 21, lacs.

Application filed July 25, 1905. Serial No. 271,225.

To all whom it may concern:

kiln by which the advantages of both the wet and dry processes of treatment may be obtained-in other words, which will enable the materials to be handled, ground, and dried, as in the ordinary cheap wet process, and caicined to the desired degree by the dry process in a continuous operation and without additional expense for treatment.

In the accompanying drawings, Figure 1 is a side elevation of a rotary kiln embodying ourlnventlon. Fig. 21sa1ong1tud1nal section,

on an enlarged scale, through the adjoining ends of the two sections of the kiln; and Fig. 3 is a cross-section through the primary or receiving kiln-section.

The kiln comprises two sections 1 and 2, preferably arranged in an inclined position, as shown, and in longitudinal alinement for the feed of the material by gravity therethrough. The primary or receiving kiln-section 1 is-connected at its inlet end with a stack 3 and is adapted to be supplied with the material to be treated at said end in any suitable manner. The lower end of the section 1 carries a frusto-conical chute 4, having its enlargedend disposed therein and suitably fastened thereto and its reduced end projecting therefrom and into the upper or inlet end of the section 2. v

The section 2 is mounted at its outer end in a hood 5,, carried by a suitable support 6, through which hood the calcined material is discharged. The chute 4 permits the material treated in the primary or receiving section 1 to be discharged into the delivery-section 2 without loss and without positively connecting said sections together, whereby the two sections may be supported for independent rotation at different rates of speed.

Each section carries one or more tracks 7, engaging supporting-wheels 8, mounted upon blocks or other suitable supports 9, while each kiln is driven by independent sets of drivegearing 10 and 11, each consisting in the pres- 'tion.

ent instance of the drive-shaft 12, in gear with a power-shaft l3 and carrying a pinion 14, meshing with a tooth-rim 15, fixed to thekilnsection. The two sets of gearing may be driven from a common source of power and adapt the two kiln-sections to be'driven at the same or different rates of speed, as may be found most desirable in the process of treatment.

The raw material is introduced into the upper end of the kiln-section 1 as a slurry in the ".me manner as is customarily done in a wetprocess mill and then feeds longitudinally through the section 1 to the section 2. Upon the interior of the section 1 are arranged shelves 16 of angle form, said shelves being radially arranged to the axis of said section,

and provided with right-fangularly arranged f anges 17, transversely slotted for the passage i bolts 18, fastening them to the body of the in-section. This construction permits the a ielves to be adjusted to lie parallel with or attrying angles to the axis of the kiln to act u on the material according to conditions. These shelves lift the material under treatn ent and toss it about in the section, thus exp ising all portions thereof to the heated prod nets of combustion passing through said see- In practice the kiln-section 2 is heated in any desired manner, and the waste portion of the heat passes therefrom into the section 1 and dries the material feeding therethrough. By rotating the section 1 at a higher rate of speed than the section 2 the wet material passing therethrough will be agitated to a high degree by the shelves 16, so that when the material reaches the chute 4 it will be power-shafts 13 and may be connected there- 'ith by suitable belting, as indicated in dotted l nes. This method of treatment permits the \aterial to be ground and handled according to the ordinary cheap wet process and dried a 1d finally calcined in a dry or powdery condition according to the dry process, the inex- IIO BEST AVAILABLE COP,

pensiveness of treatment of the former and large output per kiln of the latter being thereby'secured without additional cost of fuel, as the Waste heat from the delivery or dry-kiln section 2 is utilized to heat the material being initially treated in the receiving or wetkiln section 1.

Having thus fully described our invention, what We claim as new, and desire to secure by Letters Patent, is'

-1. A rotary'kiln comprising communicating independently-rotatable sections, one of said section's being provided with agitating devices adjustable to lie at different angles to the axis thereof, and means for rotating said sections at varying speeds.

2. A kiln comprising alined independentlyrotatable sections, the delivery end of one section being provided with a chute secured therein at one end and having a reduced end projecting into the receiving end of the other section.

3. A kiln comprising independently-rotata ble sections, the delivery end of one section being provided with a frusto-conical chute projected into the receiving end of the other section.

4. A kiln comprisinga receiving-section provided with agitators therein adjustable to lie at different angles to the axis thereof, a

delivery-section, a chute secured at one end Within the delivery end of the receiving-section and having a reduced end projecting into the receiving end of the delivery-section, and means for rotating the section at varying speeds.

5. A kiln comprising longitudinally-alined receiving and delivery sections, the receivingsection being adapted to receive the material in a wet state and provided with agitators adjustable to lie at different angles to the axis thereof and agitate said material, and the delivery-section being adapted to receive the dried material from said receiving-section for calcining such dried material, the sections being in communication for the passage of Waste heat from one section to the other, a chute within the outlet end of the receiving-section and having a contracted end projecting into the inlet end of the receiving-section, and means for rotating the sections at varying speeds.

In testimony whereof we afiix our signatures in presence of two witnesses.

JAMES H. LOGAN. WILLIAM H. SIMMONS.

Witnessesi H. L. HOLMES, E. A. COPELAND. 

